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Jamie Bartlett exposes an encrypted underworld to the Internet in his book The Dark Net: "Anybody with something to hide, whether it's for good reasons or for ill, finds a very natural home there."

Names are useful. We use them to catch someone's attention, to talk about them. Do animals create names for each other like we do? Yes, turns out. Here's a crazy example, with a dastardly back story.

The U.N.'s Intergovernmental Panel on Climate Change has just released its fifth report on the rapidly closing window of time to take action on reducing greenhouse gases.

Vaccination isn't a perfect defense against flu. But vaccines remain the most reliable way to reduce the risk from an illness that causes thousands of deaths in the U.S. during a typical flu season.

Oceanside Unified School District is the first district in California to adopt a "zero waste" program.

For your weekend, here are three recommendations for stories that may surprise you about the rise of OxyContin, the fall of Venezuela and an undocumented immigrant who made money for Goldman Sachs.

America's Test Kitchen experts Jack Bishop and Bridget Lancaster join Fresh Air to explain what makes a great marinade — and why you might want to add an anchovy or two to your next beef stew.

In fiction, Karen Thompson Walker's sci-fi debut and Vladimir Nabokov's unfinished final novel arrive in paperback. In softcover nonfiction, Toby Wilkinson reviews Egypt's political past; Alec Wilkinson surveys 19th-century polar exploration; and William Broad probes the science of yoga.

Airs Monday, September 23, 2013 at 9 p.m. on KPBS TV

Years in the making, the new rules will require chain restaurants with 20 or more locations to post calorie information on their menus. Even movie theaters and vending machines are covered.